Pinking scissors



May 27, 1952 J. J. CARNEY PINKING SCISSORS Original Filed Sept. 27, 1946INVENTOR. J mss J CARA/Ev.

BY i

Reissued May 27, 1952 PINKING SCISSORS James J. Carney, deceased, lateof Wethersfield, Conn., by The United Tool & Die Company, Elmwood,Conn., assignee Original No. 2,490,414, dated December 6, 1949,

Serial No. 699,613, September 27, 1946. Application for reissue January17, 1952, Serial No.

12 Claims.

This invention relates to pinking scissors and more particularly to suchscissors as are intended for cutting sheet material such as cloth, orthe like, and providing a pinked or staggered edge thereon which isespecially suited for preventing unraveling of said material.

An object of this invention is to provide a pinking scissors of a novelconstruction whereby it is rendered durable, economical to manufacture,and highly eflicient in its operation.

A further object of the present invention is to provide a pinkingscissors having novel means associated with the cutting edge of thescissors for retaining the sheet material in proper position relativelythereto to be cut with a pinked edge having a series of sharply definedpoints.

Further objects and advantages of this invention will be more clearlyunderstood from the following description and from the accompanyingdrawings, in which:

Fig. 1 is an elevational side view of a pinking scissors embodying myinvention.

Fig. 2 is an elevational edge view of said scissors.

Fig. 3 is an enlarged view in vertical section on line 3-3 of Fig. 1.

Fig. 4 is an enlarged sectional view of a portion of said scissors online 4-4 of Fig. 1.

Fig. 5 is an enlarged sectional view of a portion of the end of one ofthe blades of said scissors on line 5-5 of Fig. 1.

Fig. 6 is an enlarged fragmentary elevational view of opposite bladeportions showing the formation of the cutting teeth therein.

Fig. 7 is a fragmentary elevational view of a piece of sheet materialshowing a cut made with my improved scissors.

Fig. 8 is a fragmentary elevational view of a portion of a scissorsblade showing a piece of sheet material being cut therewith.

As shown in the drawings, my improved pinking scissors may comprise apair of blades 5-5 having thereon suitable handles 66, the said bladesbeing pivotally connected at I by means of a pivot screw 8 having asuitable nut 9 thereon with a spring washer Ill between said nut and theblades.

Each of the blades 55 has a flat side, which is substantially normal tothe axis of the pivotal connection, and a transverse edge with a seriesMatter enclosed in heavy brackets I: appears in the original patent butforms no part of this reissue specification; matter printed in italicsindicates the additions made by reissue.

of teeth l2 which are formed crosswise in the said edge of the blade toprovide a serrated cutting edge and are positioned in the blades so thatthe high points of the teeth on [one] each blade and the low points ofthose on the opposite blade will be respectively on arcs having theircenters substantially on the said axis of the pivotal connection and inregister as clearly illustrated in Fig. 1 of the drawings. As shown inFig. 3 of the drawings, it will be noted that the opposed sides of saidblades are disposed parallel to each other on opposite sides of acentral line indicated at AA and that the notches forming the points ofthe teeth 12 are cut across the transverse edge of each blade asindicated at [3. It will also be noted that, during the operation of thescissors, the opposite rows of teeth move past each other and that thecutting edge on each blade runs along the sides of said teeth.

In order to retain the cloth, or sheet of material, which is to be cut,in position so that the said teeth will cut to, leave sharply definedpinked edges, I provide a supporting surface by means of a flange Mwhich preferably extends from a cover I5 on each blade and is disposedover and in front of the teeth l2 when the teeth on the opposite bladesare moved relatively to each other during a cutting operation. Thesurfaces of the said flanges M will engage the sheet material, duringthe cutting operation and support it so that the scissors may be heldperpendicularly to the plane of the cloth, in the conventional manner,and the portion of the sheet of material which is being cut will bedisposed parallel to the sides of the teeth with the cutting edgesthereon and the cut edge will thereby take the form of said teeth, asclearly shown in Fig. 7.

In order to prevent the accumulation of lint under the supportingflanges l4 and increase the efliciency of said scissors for cutting apinked edge, I provide a series of notches in said flanges which are inregister with the teeth I2 and form a row of teeth I8 that serve toengage the flexible material which is to be cut by said scissors andsupport the said material, as clearly illustrated in Fig. 3. so as toensure the cutting of a pinked edge with uniform teeth therein.

Means other than the flange [4 may be provided for retaining the sheetmaterial in position relatively to the teeth in the same manner as 3above described. Such means may be in the form of a guard secured to thefront edge of the blades and running along said edge over the teeth I2,or such guard or flange may be provided in other forms so long as asupporting surface is provided adjacent to and running over the pointsof the teeth 12, as clearly described herein and illustrated in thedrawings, for supporting the portion of the sheet material being cut soas to permit portions of said material to extend from the edge of thesupporting surface to the cutting edge portion at the bottom of a toothon one blade, while the supporting surface on the opposite bladesupports the material so as to permit the [cloth] material to be cutwith the cutting edge [portion] 4 portions at the [top] tops of saidteeth.

If desired, the cover plates 15 may be secured as illustrated bymounting them between the head 8 or the nut 9 and their respective blade5 for securing the plates thereon with supporting flanges [4 extendinginwardly across the tops of the teeth I2 for a portion of the distanceacross the edges of the blades. The front ends of said cover plates maybe bent backwardly, as at It in Fig. 5, to engage a beveled edge I! soas to lock a the end of the plate to the blade against displacementthereon and prevent said plate from moving away during cuttingoperations.

During the operation of cutting a piece of sheet material, such as clothor the like, the material is supported by means of the flanges I4, asclearly shown in Figs. 3 and 8, so that, as the blades are movedtogether, the portion of the material being out is carried over theedges of the flanges l4 and between the cutting edges at the sides ofthe teeth 12, and a pinked edge will be cut as clearly illustratedinFlg. 7. While the illustration in Fig. 8 does not show the actualposition of the material as it is being out between the two blades, itillustrates the relation of the sheet with the cutting edge of the teethwhich results in the formation of the points or pinked edges illustratedin Fig. '7.

It has also been found that in order to provide for eflicient cuttingoperation of said scissors, it is of primary importance that theco-operating cutting edge portions on the opposite teeth be so formedthat they will be relatively at an angle generally divergent in adirection away from the pivotal connection, so that the cutting pointbetween the cutting edges of the blades will close progressively alongthe toothed formations of the opposite blades, and in a direction awayfrom the pivotal point. To accomplish this purpose, the

. teeth on one of the blades 5 are preferably formed as clearlyillustrated at 20 in Fig. 6 so that their movement, relatively to theteeth of the opposite blade, will bring the cutting edges past eachother progressively along the toothed formation and without choppingaction or jumps in the cutting as it is done by scissors. In otherwords, the actual cutting of the material will take place up the rearedge of the next tooth, down the front edge of that tooth, and so on forthe full length of the blades. This is particularly illustrated at 2|which shows the tapered relation between the cutting edges of theopposite teeth whereby the said cutting edges will open forwardly fromthe point of contact between them and continue in this relation for thefull length of the blades to provide maximum efliciency and prevent thepoints of the teeth on one blade from overriding the cutting edge of theopposite blade during the cutting operation.

While the teeth may be irregular, in order to properly register withthose of the opposite blade, it will be noted from the illustration inFig. 7 that the cut edges of the material will have uniform teeththerein. This is due to the fact that, during the relative movementbetween the blades, the actual cutting is influenced by the relativemovement of the blades on the axis of the pivotal connection and therebyresults in the cutting of uniform teeth irrespective of the irregularityin the actual shape of the said teeth. In other words, the relativemovement of the blades brings the teeth 29 in balanced alignment withthe teeth iii-a during the cutting operation so that uniform teeth willbe out along the pinked edge of the cut material.

It will be noted that the free edges of thefianges 14 are spaced fromthe actual [edge] edges of the blades so as to permit clearance betweenthe said free edges and the inner surfaces of the opposite blades foraccommodating the thickness of the material being cut, as clearlyillustrated in Fig. 3.

The said plates l5. also provide an additiona advantage since they coverthe shear blades completely and thereby eliminate the necessity of ahigh polish on said blades which is more expensive in manufacture than apolished or finished surface directly on the blades.

1'. claim:

1. A pinking scissors comprising a pair of pivotaliy connected blades,each blade having a side substantially normal to the axis of the pivotalconnection and an edge transverse to said side, and a series of teethout crosswise in the said transverse edge for providing a serratedcutting edge along the side of the blade; the said teeth having highpoints. and low points, each high point of [one] each blade and thecorresponding low point of the other blade being substantially inregister and on an are having a center substantially at the axis of thesaid pivotal connection.

A p k n ci or omprising a pair of pivotally connected blades, each bladehaving a side substantially normal to the axis of the pivotal connectionand an edge transverse to said side,

. and a series of teeth out crosswise in the said transverse edge andhaving high points and low points with cutting edge portionstherebetween providing a serrated cutting edge along said blade; eachhigh point of [one] each blade and the corresponding low point of theother blade being substantially in register and the said carp. ting edgeportions of [one] each blade cooperating with corresponding portions ofthe other blade and forming there-with angles generally divergent awayfrom the said pivotal connection.

A Dinking scissors comp is g a of air otally connected blades, eachblade having it Sid? substantially normal to the axis of the pivotalconnection and an edge transverse to said side, and a series of teethout crosswifie in said transverse edge and having high points and low pi s with a ght cutting edge portions there! between forming the sides ofsaid teeth and pro.- viding a serrated cutting edge along the saidblade; each high point of [one] each blade and the corresponding lowpoint of the other blade being substantially in register and on an archaving its center substantially at the axis of the pivotal connectionand each of said cutting edge portions of [one] each blade cooperatingwith the corresponding cutting edge portion of the other blade andgenerally diverging therefrom in a direction away from the said pivotalconnection.

4. A pinking scissors comprising a pair 01' pivotally connected bladeseach having a side substantially normal to the axis of the pivotalconnection and an edge transverse to said side, a series of teeth outcrosswise and providing a serrated cutting edge along the side of theblade, the said teeth having high points and low points, the high pointsof [one] each blade and the corresponding [blade] low points of theother blade being in register and on an are having a centersubstantially at the center of said pivotal connection, and meansextending over the said transverse edge for supporting a sheet ofmaterial while bein cut in said scissors.

5. A pinking scissors comprising a pair of pivotally connected bladeseach having a side substantially normal to the axis of the pivotalconnection and an edge transverse to said side, a series of [said] teethout crosswise in the said transverse edge and having high and low pointswith cutting edge portions therebetween providing a serrated cuttingedge along said blade, each high point of oneblade and the correspondinglow point of the other blade bein substantially in register and the saidcutting edge portions of one blade corresponding with the said portionsof the other blade and forming therewith angles generally divergent in adirection away from the said pivotal connection, a plate mounted to saidblade, and a portion on said plate running along and over the said teethfor supporting a sheet of material relative to said cutting edge whilebeing cut in said scissors.

6. A pinking scissors comprising a pair of pivotally connected bladeseach having an inner and an outer side substantially normal to th axisof the pivotal connection and an edge transverse to said inner side, aseries of teeth out crosswise in the said transverse edge and havinghigh points and low [point] points with cutting edge portionstherebetween providing a serrated cutting edge along said inner sid ofthe blade; each high point of one blade and the corresponding low[points] point of the other being in register; the said cutting edgeportions of one blade cooperating with the corresponding cutting edgeportions of the other blade and generally diverging therefrom in adirection away from th said pivotal connection, and means on said bladesproviding a supporting surface extending over the said teeth forsupporting a sheet of material perpendicular to the inner sides of theblades and causing the portion of said material bein cut to be disposedparallel to said inner sides for producin a pinked edge along the lineof cut made by said serrated cutting edge.

7. A pinking scissors of the character described comprising a pair ofpivotally connected blades each having an inner side and an outer sidesubstantially normal to the pivotal connection and an edge transverse tothe said sides, a series of teeth out crosswise in the said transverseedge and having high points and low points with straight cutting edgeportions therebetween formin the sides of the teeth and providing aserrated cutting edge along the inner side of said blade; thecorresponding low points of one blade and the high points of the otherblade being substantially in register and each of said cutting edgeportions of one blade cooperating with the corresponding cutting edge[portions] portion of the other blade and generally diverging therefromaway from the said pivotal connection, a cover plate mounted upon theouter side of said blade, and a portion on said cover plate extendforproducing a pinked edge along a line of cut made by said serratedcutting edges.

8. Apinking scissors comprising a pair of pivotally connected blades,each blade having a side substantially normal to the axis of the pivotedconnection and an edge transverse to said side, a series Of teeth outcrosswise in said transverse edge for providing a serrated cutting edgealong the side of the blade, and material supporting means extendingacross the tops of said teeth for supporting a material relatively tosaid teeth as it is being cut in said scissors.

9. A pinking scissors comprising a pair of pivotally connected bladeseach blade having a side substantially normal to the axis of the pivotalconnection and an edge transverse to said side, a series of teeth cutcrosswise in the said transverse edge for providing a serrated cuttingedge along the side of the blade, and means providing a support runningalong each of said blades and over the tops of said teeth for supportinga sheet of material relatively to said teeth while being cut in saidscissors.

10. A pinking scissors of the character described comprising a pair ofpivotally connected blades, each blade having a side substantiallynormal to the axis of the pivotal connection and an edge transverse tosaid side, a series of teeth out crosswise in the said transverse edgeand providing a serrated cutting edge along the side of the blade, acover secured to the outside of the blade, and a portion projecting fromsaid cover and running over the tops of said teeth for supporting asheet of material relatively to said teeth while it is being cut in saidscissors.

11. A pinking scissors of the character described comprising a pair ofpivotally connected blades each having a side substantially normal tothe axis of the pivotal connection and an edge transverse to said sideand running along the blade, a series of teeth out crosswise in the saidtransverse edge and providing a serrated cutting edge along the saidside of the blade, a flange projecting inwardly over the said transverseedge and running along the tops of said teeth, said flange having aseries of notches therein to permit the egress of lint and forming teethin said flanges in register with the teeth in the said transverse edgeand disposed perpendicularly thereto for supporting a sheet of materialrelatively to the said cutting edge while it is being cut in saidscissors.

12. A pinking scissors of the character described comprising a pair ofpivotally connected blades each having an inner and an outer sidesubstantially normal to the axis of said blade and an edge transverse tosaid sides, a series of teeth out crosswise in the said transverse edgefor providing a serrated cutting edge along the inner side of the blade,a cover mounted over the outer side of the blade, and a flange on saidcover projecting inwardly over the tops of the teeth in the blade forsupporting a sheet of material relatively to the said teeth while it isbeing cut in said scissors.

THE UNITED TOOL & DIE COMPANY,

Assignee of James J. Carney, Deceased, By EDWARD J. CARNEY,

President.

(References on following page) sum 7' Axum-Emma cum Number The followingreferenees age of reeqi'd in the 683,455 file of this patent or theqr-igina l patem: 11mm; sums mums 5 Number Name Date Number 297,964Bateman May 6, 1884 5 45 5 8 Name Date Flowers Oct, 1, 1901 SchusterAug. 28, 192.3. Weidauer Aug. 11, 1936.

FOREIGN PATENTS Country Date

